More useful options for customizing the user interface are found in ALT > MENU >Miscellaneous Stuff:

The Depth of Field (DOF) calculator is a useful tool built into the CHDK. Based on the real aperture value and the focal length, it is able to compute values such as near sharpness limit, far sharpness limit, hyperfocal distance, and depth of field. The entry Show DOF Calculator allows switching off the DOF calculator [...]

The Miscellaneous Values submenu combines settings for the display of values related to focus, zoom, and exposure. The first entry, Show Misc Values, determines when these values are shown: not at all (Don’t), always (Always), or when the shutter button is half-pressed (Shoot). The entry Show values in video can be set to show these [...]

In the analog days, an exchangeable ground glass was mostly a feature of professional cameras. Today, many professional and semi-professional DSLRs still offer the option of exchanging the ground glass. Some of these screens come with etched grids, which can be especially useful for architectural work and micro- or macrophotography. With digital compact cameras and [...]

The number of entries in the CHDK menu is quite overwhelming. Searching the same items again and again and stepping through the submenus can be quite tedious. The CHDK therefore offers the option to organize the most important menu items (favorites) into a user-defined menu. This menu is, by default, accessible through ALT > MENU [...]

The amount of information the CHDK is able to show on the display is amazing—almost any camera state can be displayed on the screen. Therefore, it becomes mandatory to select the information carefully and to arrange its layout properly. Otherwise, you would be overwhelmed by an information overload that would be disturbing in shooting situations [...]

The CHDK has many functions to customize the user interface. Most of these functions are found in the submenu Visual Settings. Here you can change the language of the CHDK menus. (The language of the native camera menus is changed separately. Consult your camera’s user manual to do so.) You can change the OSD Codepage [...]